Maximum Range Performance: The MAX "Mr Hop" Hop-Up Rubber is designed for VSR & GBB Hop Units, delivering superior range and trajectory control. Enhanced Shot Accuracy: Features unique internal pressure points to dramatically improve shot performance and precision. Versatile Hardness Options: Available in 50°, 60°, 70°, 75°, and 80° hardness ratings to cater to various airsoft setups and preferences. Compatible and Reliable: Specifically tailored for VSR and GBB specifications, ensuring seamless integration and consistent results. Optimized for Heavy BBs: Provides excellent hop effect and stability, especially with heavier BBs, for greater accuracy and range.